Hello Frank!
The word "Appearance" has several translations into Russian language, include "Вид" and "Появление" depending on the context. The word "Вид" is synonym for the word "View". The word "Появление", in our case, is synonym for the word "Order". The Appearance option in the Preferences means that functions in the symbol list will be shown in order by appearance. So the word "Появление" in this case is more suitable. Additionally, ru.po already contains the similar translation: msgid "Sort by _Appearance" msgstr "Сортировать по _появлению"
Sincerely, Dmitry Unruh.